Abstract
Abstract Simplified soot formation models are developed for two fuels—propylene and methylmethacrylate—representative of the pyrolysates derived from burning polymeric materials in compartment fires. The models incorporate descriptions of the key processes of soot particle nucleation, coagulation and surface growth and introduce fuel-dependent model coefficients which are established through detailed comparisons between laminar diffusion flame experiment and computational prediction. A laminar flamelet approach is employed to simplify the computation of the scalar fields for composition and temperature. For purposes of model evaluation and calibration, detailed property maps are constructed in the two flames for mixture fraction, using probe sampling and mass spectrometric analysis, temperature by fine wire thermocouple and soot volume fraction by laser extinction. The level of complexity introduced reflects the compromise between the physical mechanisms described and the computational demands of the target application to the improved field modelling of fires.
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